A combustible gas indicator is used to determine （）.

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• A fire starting by spontaneous combustion can be expected in which condition?（）.

  A . Paints，varnish，or other liquid flammables are stowed in a dry stores locker B . Inert cargoes such as pig iron are loaded in a wet condition C . Oily rags are stowed in a metal pail D . Clean mattresses are stored in contact with an electric light bul

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• Each cylinder in a two stroke cycle engine experiences combustion（）.

  A . once each crankshaft revolution B . twice each crankshaft revolution C . every other crankshaft revolution D . every fourth stroke

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• Which method is used to supply inert gas from a flue gas system to the cargo tanks?（）

  A . Exhaust gas pressure from the stack B . High capacity fan C . Inert gas compressor D . Natural aspiratio

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• A combination combustible gas and oxygen indicator is an instrument that measures the（） of both combustible gas and oxygen; each is indicated on a separate meter.

  A . purifies B . combinations C . concentrations D . filter

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• Successful combustion inside the cylinders of a diesel engine is dependent upon （）.

  A . fine atomization B . high temperature C . good mixing of fuel and air D . all of the above

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• The air required for combustion is taken from the engine room through a filter fitted on the turbochargerThis reduces the risk for too and contamination of the combustion air（）

  A . high temperatures B . low temperatures C . wet D . dirty

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• Combustible gas indicators operate by drawing an air sample into the instrument（）.

  A . over an electrically heated platinum filament B . where it is mixed with nitrogen C . where it is ignited by a sparking device D . where its specific gravity is measured

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• Theoretical perfect combustion in a diesel engine yields by-products of （）.

  A . aldehydes and carbon dioxide B . water vapor and carbon monoxide C . nitrogen and carbon monoxide D . water vapor and carbon dioxide

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• Before entering a tank，always check the vapor content（）a combustible gas indicator.

  A . with B . by C . of D . for

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• Poor combustion in a diesel engine can be caused by （）.

  A . high compression pressure B . low intake air temperature C . low exhaust pressure D . high scavenge air pressure

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• On a diesel engine, fuel is delivered into the combustion space by （）.

  A . a cooling system B . a lubrication oil system C . an electric system D . an injection system

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• Combustion knock occurring in a diesel engine can be caused by （）

  A . low coolant temperature B . insufficient fuel C . high ambient temperature D . carbon buildup on the injector ti

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• Incomplete combustion in a running diesel engine can cause piston rings to become stuck as a result of （）

  A . residual carbon deposits B . lube oil viscosity breakdown C . uneven heat expansion of the rings D . uneven heat expansion of the pisto

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• Fires occurring in combustible metals, such as sodium or magnesium, are classified as a （）.

  A . class A B . class B C . class C D . class D

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• What is commonly used to create turbulence in a diesel engine combustion system?（）

  A . Shape of the piston crowns B . Increasing the compression ratios C . Increasing the piston crowns D . Increasing the turbocharger gear ratio

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• Gas exchange, which is a basic part of the cycle of an internal combustion engine, is（）

  A . the supply of normal air and removal of compressed air B . the supply of fuel oil and combustion of the atomized oil C . the supply of fresh air and removal of exhaust gases D . the supply of fresh air and removal of the extra heat

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• Combustible gas indicators measure the presence of combustible gas as a percentage of the（）.

  A . flash point B . upper explosive limit C . lower explosive limit D . fire point

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• Proper combustion in a boiler would be indicated by （）.

  A . yellowish flame B . golden yellow flame C . white flame D . brilliant white flame

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• The component in an inert gas system used for cleaning the gas of solid and sulphur combustion products，while simultaneously cooling the inert gas，is called the（）.

  A . filter B . cooler C . scrubber D . purifier

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• A combustible gas indicator meter is calibrated to read the percentage of（）.

  A . vapor to oxygen B . the flammable limit concentration C . the autoignition concentration D . the lower explosive limit concentretio

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• How does combustion air enter the cylinder of a two-cycle diesel engine?（）

  A . Cylinder head valves B . Ports C . Turbo chargers D . Bleeder valve

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• A pumproom is suspected of accumulating gases after a ventilation machinery breakdown. Where should the combustible gas indicator case be placed when testing the pumproom atmosphere for combustible gases? （）

  A . In the lower level of the pumproom B . In the middle level of the pumproom C . In the upper level of the pumproom D . On the deck outside the pumproom

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• 4、翻译句子，注意斜体字的词类转换。 A continuous increase in the temperature of a gas confined in a container will lead to a continuous increase in the internal pressure within the gas.

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